diff options
Diffstat (limited to 'perl-install/resize_fat/boot_sector.pm')
| -rw-r--r-- | perl-install/resize_fat/boot_sector.pm | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/perl-install/resize_fat/boot_sector.pm b/perl-install/resize_fat/boot_sector.pm deleted file mode 100644 index 48e2a8d4e..000000000 --- a/perl-install/resize_fat/boot_sector.pm +++ /dev/null @@ -1,107 +0,0 @@ -package resize_fat::boot_sector; - -use diagnostics; -use strict; - -use common qw(:common :system :constant); -use resize_fat::io; -use resize_fat::any; -use resize_fat::directory; - - -my $format = "a3 a8 S C S C S S C S S S I I I S S I S S a458 S"; -my @fields = ( - 'boot_jump', #- boot strap short or near jump - 'system_id', #- Name - can be used to special case partition manager volumes - 'sector_size', #- bytes per logical sector - 'cluster_size_in_sectors', #- sectors/cluster - 'nb_reserved', #- reserved sectors - 'nb_fats', #- number of FATs - 'nb_root_dir_entries', #- number of root directory entries - 'small_nb_sectors', #- number of sectors: big_nb_sectors supersedes - 'media', #- media code - 'fat16_fat_length', #- sectors/FAT for FAT12/16 - 'sectors_per_track', - 'nb_heads', - 'nb_hidden', #- (unused) - 'big_nb_sectors', #- number of sectors (if small_nb_sectors == 0) - -#- FAT32-only entries - 'fat32_fat_length', #- size of FAT in sectors - 'fat32_flags', #- bit8: fat mirroring, - #- low4: active fat - 'fat32_version', #- minor * 256 + major - 'fat32_root_dir_cluster', - 'info_offset_in_sectors', - 'fat32_backup_sector', - -#- Common again... - 'boot_code', #- Boot code (or message) - 'boot_sign', #- 0xAA55 -); - -1; - - -#- trimfs_init_boot_sector() - reads in the boot sector - gets important info out -#- of boot sector, and puts in main structure - performs sanity checks - returns 1 -#- on success, 0 on failureparameters: filesystem an empty structure to fill. -sub read($) { - my ($fs) = @_; - - my $boot = eval { resize_fat::io::read($fs, 0, $SECTORSIZE) }; $@ and die "reading boot sector failed on device $fs->{fs_name}"; - @{$fs}{@fields} = unpack $format, $boot; - - $fs->{nb_sectors} = $fs->{small_nb_sectors} || $fs->{big_nb_sectors}; - $fs->{cluster_size} = $fs->{cluster_size_in_sectors} * $fs->{sector_size}; - - $fs->{boot_sign} == 0xAA55 or die "Invalid signature for a MS-based filesystem."; - $fs->{nb_fats} == 2 or die "Weird number of FATs: $fs->{nb_fats}, not 2.", - $fs->{nb_sectors} < 32 and die "Too few sectors for viable file system\n"; - - if ($fs->{fat16_fat_length}) { - #- asserting FAT16, will be verified later on - $fs->{fs_type} = 'FAT16'; - $fs->{fs_type_size} = 16; - $fs->{fat_length} = $fs->{fat16_fat_length}; - $resize_fat::bad_cluster_value = 0xfff7; #- 2**16 - 1 - } else { - $resize_fat::isFAT32 = 1; - $fs->{fs_type} = 'FAT32'; - $fs->{fs_type_size} = 32; - $fs->{fat_length} = $fs->{fat32_fat_length}; - - $fs->{nb_root_dir_entries} = 0; - $fs->{info_offset} = $fs->{info_offset_in_sectors} * $fs->{sector_size}; - $resize_fat::bad_cluster_value = 0xffffff7; - } - - $fs->{fat_offset} = $fs->{nb_reserved} * $fs->{sector_size}; - $fs->{fat_size} = $fs->{fat_length} * $fs->{sector_size}; - $fs->{root_dir_offset} = $fs->{fat_offset} + $fs->{fat_size} * $fs->{nb_fats}; - $fs->{root_dir_size} = $fs->{nb_root_dir_entries} * resize_fat::directory::entry_size(); - $fs->{cluster_offset} = $fs->{root_dir_offset} + $fs->{root_dir_size} - 2 * $fs->{cluster_size}; - - $fs->{nb_fat_entries} = divide($fs->{fat_size}, $fs->{fs_type_size} / 8); - - #- - 2 because clusters 0 & 1 doesn't exist - $fs->{nb_clusters} = divide($fs->{nb_sectors} * $fs->{sector_size} - $fs->{cluster_offset}, $fs->{cluster_size}) - 2; - - $fs->{dir_entries_per_cluster} = divide($fs->{cluster_size}, psizeof($format)); - -#- $fs->{nb_clusters} >= resize_fat::any::min_cluster_count($fs) or die "error: not enough sectors for a $fs->{fs_type}\n"; - $fs->{nb_clusters} < resize_fat::any::max_cluster_count($fs) or die "error: too many sectors for a $fs->{fs_type}\n"; -} - -sub write($) { - my ($fs) = @_; - my $boot = pack($format, @{$fs}{@fields}); - - eval { resize_fat::io::write($fs, 0, $SECTORSIZE, $boot) }; $@ and die "writing the boot sector failed on device $fs->{fs_name}"; - - if ($resize_fat::isFAT32) { - #- write backup - eval { resize_fat::io::write($fs, $fs->{fat32_backup_sector} * $SECTORSIZE, $SECTORSIZE, $boot) }; - $@ and die "writing the backup boot sector (#$fs->{fat32_backup_sector}) failed on device $fs->{fs_name}"; - } -} |